Commit 5b75a6af authored Aug 22, 2014 by Will Deacon

arm64: perf: don't rely on layout of pt_regs when grabbing sp or pc



The current perf_regs code relies on sp and pc sitting just off the end
of the pt_regs->regs array. This is ugly and fragile, so this patch
checks for these register explicitly and returns the appropriate field.

Acked-by: Jean Pihet <jean.pihet@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

parent 85487edd

arch/arm64/kernel/perf_regs.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -24,6 +24,12 @@ u64 perf_reg_value(struct pt_regs *regs, int idx)
		return regs->compat_lr;
		}

		if ((u32)idx == PERF_REG_ARM64_SP)
		return regs->sp;

		if ((u32)idx == PERF_REG_ARM64_PC)
		return regs->pc;

		return regs->regs[idx];
		}